He's taking Biology this year, and the course starts with the study of single-celled organisms and moves on to stuff like mushrooms and other fungi.
No, I do not know if it is actually slimy.
It looks gross.
I looked under our hemlock trees where we usually have puffballs, but there aren't any there right now.
He also did an exercise where he had to collect pond water, add different things to the jars, let them 'work' for a few days and then examine the water under a microscope. We saw lots of little wiggly things - amoebae, paramecia, euglena and some others I can't remember!